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    "<h1>大纲<span class=\"tocSkip\"></span></h1>\n",
    "<div class=\"toc\"><ul class=\"toc-item\"><li><span><a href=\"#队列大小的获取\" data-toc-modified-id=\"队列大小的获取-1\"><span class=\"toc-item-num\">1&nbsp;&nbsp;</span>队列大小的获取</a></span></li></ul></div>"
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   "source": [
    "# 队列大小的获取\n",
    "1. 队列不可迭代,不能使用for循环来统计队列中元素的个数\n",
    "1. 自己统计,在put的时候变量+1,pop的时候变量-1"
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     "ename": "TypeError",
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      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-3-302a30d8c133>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m      9\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m     10\u001b[0m \u001b[0mnum\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;36m0\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m---> 11\u001b[0;31m \u001b[0;32mfor\u001b[0m \u001b[0mi\u001b[0m \u001b[0;32min\u001b[0m \u001b[0mq\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m     12\u001b[0m     \u001b[0mnum\u001b[0m \u001b[0;34m+=\u001b[0m \u001b[0;36m1\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m     13\u001b[0m \u001b[0mnum\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
      "\u001b[0;31mTypeError\u001b[0m: 'Queue' object is not iterable"
     ]
    }
   ],
   "source": [
    "# 队列不可迭代,不能使用for循环来统计队列中元素的个数\n",
    "import queue\n",
    "q = queue.Queue()\n",
    "q.put('wangkaixuan')\n",
    "q.put('wangkaixuan')\n",
    "q.put('wangkaixuan')\n",
    "q.put('wangkaixuan')\n",
    "q.put('wangkaixuan')\n",
    "\n",
    "num = 0\n",
    "for i in q:\n",
    "    num += 1\n",
    "num    "
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